webview.cpp

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    HDC windowDC = ::GetDC(m_viewWindow);
    HDC bitmapDC = ::CreateCompatibleDC(windowDC);
    ::SelectObject(bitmapDC, m_backingStoreBitmap.get());
    
    // Scroll the bitmap.
    RECT scrollRectWin(scrollViewRect);
    RECT clipRectWin(clipRect);
    ::ScrollDC(bitmapDC, dx, dy, &scrollRectWin, &clipRectWin, updateRegion, 0);
    RECT regionBox;
    ::GetRgnBox(updateRegion, &regionBox);

    // Flush.
    GdiFlush();

    // Add the dirty region to the backing store's dirty region.
    addToDirtyRegion(updateRegion);

    if (m_uiDelegatePrivate)
        m_uiDelegatePrivate->webViewScrolled(this);

    // Update the backing store.
    updateBackingStore(frameView, bitmapDC, false);

    // Clean up.
    ::DeleteDC(bitmapDC);
    ::ReleaseDC(m_viewWindow, windowDC);

}

// This emulates the Mac smarts for painting rects intelligently.  This is very
// important for us, since we double buffer based off dirty rects.
static void getUpdateRects(HRGN region, const IntRect& dirtyRect, Vector<IntRect>& rects)
{
    ASSERT_ARG(region, region);

    const int cRectThreshold = 10;
    const float cWastedSpaceThreshold = 0.75f;

    rects.clear();

    DWORD regionDataSize = GetRegionData(region, sizeof(RGNDATA), NULL);
    if (!regionDataSize) {
        rects.append(dirtyRect);
        return;
    }

    Vector<unsigned char> buffer(regionDataSize);
    RGNDATA* regionData = reinterpret_cast<RGNDATA*>(buffer.data());
    GetRegionData(region, regionDataSize, regionData);
    if (regionData->rdh.nCount > cRectThreshold) {
        rects.append(dirtyRect);
        return;
    }

    double singlePixels = 0.0;
    unsigned i;
    RECT* rect;
    for (i = 0, rect = reinterpret_cast<RECT*>(regionData->Buffer); i < regionData->rdh.nCount; i++, rect++)
        singlePixels += (rect->right - rect->left) * (rect->bottom - rect->top);

    double unionPixels = dirtyRect.width() * dirtyRect.height();
    double wastedSpace = 1.0 - (singlePixels / unionPixels);
    if (wastedSpace <= cWastedSpaceThreshold) {
        rects.append(dirtyRect);
        return;
    }

    for (i = 0, rect = reinterpret_cast<RECT*>(regionData->Buffer); i < regionData->rdh.nCount; i++, rect++)
        rects.append(*rect);
}

void WebView::updateBackingStore(FrameView* frameView, HDC dc, bool backingStoreCompletelyDirty, WindowsToPaint windowsToPaint)
{
    LOCAL_GDI_COUNTER(0, __FUNCTION__);

    HDC windowDC = 0;
    HDC bitmapDC = dc;
    if (!dc) {
        windowDC = ::GetDC(m_viewWindow);
        bitmapDC = ::CreateCompatibleDC(windowDC);
        ::SelectObject(bitmapDC, m_backingStoreBitmap.get());
    }

    if (m_backingStoreBitmap && (m_backingStoreDirtyRegion || backingStoreCompletelyDirty)) {
        // Do a layout first so that everything we render to the backing store is always current.
        if (Frame* coreFrame = core(m_mainFrame))
            if (FrameView* view = coreFrame->view())
                view->layoutIfNeededRecursive();

        Vector<IntRect> paintRects;
        if (!backingStoreCompletelyDirty) {
            RECT regionBox;
            ::GetRgnBox(m_backingStoreDirtyRegion.get(), &regionBox);
            getUpdateRects(m_backingStoreDirtyRegion.get(), regionBox, paintRects);
        } else {
            RECT clientRect;
            ::GetClientRect(m_viewWindow, &clientRect);
            paintRects.append(clientRect);
        }

        for (unsigned i = 0; i < paintRects.size(); ++i)
            paintIntoBackingStore(frameView, bitmapDC, paintRects[i], windowsToPaint);

        if (m_uiDelegatePrivate) {
            COMPtr<IWebUIDelegatePrivate2> uiDelegatePrivate2(Query, m_uiDelegatePrivate);
            if (uiDelegatePrivate2)
                uiDelegatePrivate2->webViewPainted(this);
        }

        m_backingStoreDirtyRegion.clear();
    }

    if (!dc) {
        ::DeleteDC(bitmapDC);
        ::ReleaseDC(m_viewWindow, windowDC);
    }

    GdiFlush();
}

void WebView::paint(HDC dc, LPARAM options)
{
    LOCAL_GDI_COUNTER(0, __FUNCTION__);

    Frame* coreFrame = core(m_mainFrame);
    if (!coreFrame)
        return;
    FrameView* frameView = coreFrame->view();

    m_paintCount++;

    RECT rcPaint;
    HDC hdc;
    OwnPtr<HRGN> region;
    int regionType = NULLREGION;
    PAINTSTRUCT ps;
    WindowsToPaint windowsToPaint;
    if (!dc) {
        region.set(CreateRectRgn(0,0,0,0));
        regionType = GetUpdateRgn(m_viewWindow, region.get(), false);
        hdc = BeginPaint(m_viewWindow, &ps);
        rcPaint = ps.rcPaint;
        // We're painting to the screen, and our child windows can handle
        // painting themselves to the screen.
        windowsToPaint = PaintWebViewOnly;
    } else {
        hdc = dc;
        ::GetClientRect(m_viewWindow, &rcPaint);
        if (options & PRF_ERASEBKGND)
            ::FillRect(hdc, &rcPaint, (HBRUSH)GetStockObject(WHITE_BRUSH));
        // Since we aren't painting to the screen, we want to paint all our
        // children into the HDC.
        windowsToPaint = PaintWebViewAndChildren;
    }

    HDC bitmapDC = ::CreateCompatibleDC(hdc);
    bool backingStoreCompletelyDirty = ensureBackingStore();
    ::SelectObject(bitmapDC, m_backingStoreBitmap.get());

    // Update our backing store if needed.
    updateBackingStore(frameView, bitmapDC, backingStoreCompletelyDirty, windowsToPaint);

    // Now we blit the updated backing store
    IntRect windowDirtyRect = rcPaint;
    
    // Apply the same heuristic for this update region too.
    Vector<IntRect> blitRects;
    if (region && regionType == COMPLEXREGION)
        getUpdateRects(region.get(), windowDirtyRect, blitRects);
    else
        blitRects.append(windowDirtyRect);

    for (unsigned i = 0; i < blitRects.size(); ++i)
        paintIntoWindow(bitmapDC, hdc, blitRects[i]);

    ::DeleteDC(bitmapDC);

    // Paint the gripper.
    COMPtr<IWebUIDelegate> ui;
    if (SUCCEEDED(uiDelegate(&ui))) {
        COMPtr<IWebUIDelegatePrivate> uiPrivate;
        if (SUCCEEDED(ui->QueryInterface(IID_IWebUIDelegatePrivate, (void**)&uiPrivate))) {
            RECT r;
            if (SUCCEEDED(uiPrivate->webViewResizerRect(this, &r))) {
                LOCAL_GDI_COUNTER(2, __FUNCTION__" webViewDrawResizer delegate call");
                uiPrivate->webViewDrawResizer(this, hdc, (frameView->containsScrollbarsAvoidingResizer() ? true : false), &r);
            }
        }
    }

    if (!dc)
        EndPaint(m_viewWindow, &ps);

    m_paintCount--;

    if (active())
        cancelDeleteBackingStoreSoon();
    else
        deleteBackingStoreSoon();
}

void WebView::paintIntoBackingStore(FrameView* frameView, HDC bitmapDC, const IntRect& dirtyRect, WindowsToPaint windowsToPaint)
{
    LOCAL_GDI_COUNTER(0, __FUNCTION__);

    RECT rect = dirtyRect;

#if FLASH_BACKING_STORE_REDRAW
    HDC dc = ::GetDC(m_viewWindow);
    OwnPtr<HBRUSH> yellowBrush = CreateSolidBrush(RGB(255, 255, 0));
    FillRect(dc, &rect, yellowBrush.get());
    GdiFlush();
    Sleep(50);
    paintIntoWindow(bitmapDC, dc, dirtyRect);
    ::ReleaseDC(m_viewWindow, dc);
#endif

    GraphicsContext gc(bitmapDC, m_transparent);
    gc.setShouldIncludeChildWindows(windowsToPaint == PaintWebViewAndChildren);
    gc.save();
    if (m_transparent)
        gc.clearRect(dirtyRect);
    else
        FillRect(bitmapDC, &rect, (HBRUSH)GetStockObject(WHITE_BRUSH));
    if (frameView && frameView->frame() && frameView->frame()->contentRenderer()) {
        gc.clip(dirtyRect);
        frameView->paint(&gc, dirtyRect);
    }
    gc.restore();
}

void WebView::paintIntoWindow(HDC bitmapDC, HDC windowDC, const IntRect& dirtyRect)
{
    LOCAL_GDI_COUNTER(0, __FUNCTION__);
#if FLASH_WINDOW_REDRAW
    OwnPtr<HBRUSH> greenBrush = CreateSolidBrush(RGB(0, 255, 0));
    RECT rect = dirtyRect;
    FillRect(windowDC, &rect, greenBrush.get());
    GdiFlush();
    Sleep(50);
#endif

    // Blit the dirty rect from the backing store into the same position
    // in the destination DC.
    BitBlt(windowDC, dirtyRect.x(), dirtyRect.y(), dirtyRect.width(), dirtyRect.height(), bitmapDC,
           dirtyRect.x(), dirtyRect.y(), SRCCOPY);
}

void WebView::frameRect(RECT* rect)
{
    ::GetWindowRect(m_viewWindow, rect);
}

void WebView::closeWindowSoon()
{
    m_closeWindowTimer.startOneShot(0);
    AddRef();
}

void WebView::closeWindowTimerFired(WebCore::Timer<WebView>*)
{
    closeWindow();
    Release();
}

void WebView::closeWindow()
{
    if (m_hasSpellCheckerDocumentTag) {
        if (m_editingDelegate)
            m_editingDelegate->closeSpellDocument(this);
        m_hasSpellCheckerDocumentTag = false;
    }

    COMPtr<IWebUIDelegate> ui;
    if (SUCCEEDED(uiDelegate(&ui)))
        ui->webViewClose(this);
}

bool WebView::canHandleRequest(const WebCore::ResourceRequest& request)
{
    // On the mac there's an about url protocol implementation but CFNetwork doesn't have that.
    if (equalIgnoringCase(String(request.url().protocol()), "about"))
        return true;

#if USE(CFNETWORK)
    if (CFURLProtocolCanHandleRequest(request.cfURLRequest()))
        return true;

    // FIXME: Mac WebKit calls _representationExistsForURLScheme here
    return false;
#else
    return true;
#endif
}

String WebView::standardUserAgentWithApplicationName(const String& applicationName)
{
    return String::format("Mozilla/5.0 (Windows; U; %s; %s) AppleWebKit/%s (KHTML, like Gecko)%s%s", osVersion().latin1().data(), defaultLanguage().latin1().data(), webKitVersion().latin1().data(), (applicationName.length() ? " " : ""), applicationName.latin1().data());
}

Page* WebView::page()
{
    return m_page;
}

bool WebView::handleContextMenuEvent(WPARAM wParam, LPARAM lParam)
{
    static const int contextMenuMargin = 1;

    // Translate the screen coordinates into window coordinates
    POINT coords = { GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam) };
    if (coords.x == -1 || coords.y == -1) {
        FrameView* view = m_page->mainFrame()->view();
        if (!view)
            return false;

        int rightAligned = ::GetSystemMetrics(SM_MENUDROPALIGNMENT);
        IntPoint location;

        // The context menu event was generated from the keyboard, so show the context menu by the current selection.
        Position start = m_page->mainFrame()->selection()->selection().start();
        Position end = m_page->mainFrame()->selection()->selection().end();

        if (!start.node() || !end.node())
            location = IntPoint(rightAligned ? view->contentsWidth() - contextMenuMargin : contextMenuMargin, contextMenuMargin);
        else {
            RenderObject* renderer = start.node()->renderer();
            if (!renderer)
                return false;

            // Calculate the rect of the first line of the selection (cribbed from -[WebCoreFrameBridge firstRectForDOMRange:],
            // now Frame::firstRectForRange(), which perhaps this should call).
            int extraWidthToEndOfLine = 0;

            InlineBox* startInlineBox;
            int startCaretOffset;
            start.getInlineBoxAndOffset(DOWNSTREAM, startInlineBox, startCaretOffset);
            IntRect startCaretRect = renderer->localCaretRect(startInlineBox, startCaretOffset, &extraWidthToEndOfLine);
            if (startCaretRect != IntRect())
                startCaretRect = renderer->localToAbsoluteQuad(FloatRect(startCaretRect)).enclosingBoundingBox();

            InlineBox* endInlineBox;
            int endCaretOffset;
            end.getInlineBoxAndOffset(UPSTREAM, endInlineBox, endCaretOffset);
            IntRect endCaretRect = renderer->localCaretRect(endInlineBox, endCaretOffset);
            if (endCaretRect != IntRect())
                endCaretRect = renderer->localToAbsoluteQuad(FloatRect(endCaretRect)).enclosingBoundingBox();

            IntRect firstRect;
            if (startCaretRect.y() == endCaretRect.y())
                firstRect = IntRect(min(startCaretRect.x(), endCaretRect.x()), startCaretRect.y(), abs(endCaretRect.x() - startCaretRect.x()), max(startCaretRect.height(), endCaretRect.height()));
            else
                firstRect = IntRect(startCaretRect.x(), startCaretRect.y(), startCaretRect.width() + extraWidthToEndOfLine, startCaretRect.height());

            location = IntPoint(rightAligned ? firstRect.right() : firstRect.x(), firstRect.bottom());
        }

        location = view->contentsToWindow(location);
        // FIXME: The IntSize(0, -1) is a hack to get the hit-testing to result in the selected element.
        // Ideally we'd have the position of a context menu event be separate from its target node.
        coords = location + IntSize(0, -1);
    } else {
        if (!::ScreenToClient(m_viewWindow, &coords))
            return false;